S&S Cycle - Vintage Motorcycle TECH TALK

Pretty much anything not covered by the topics above. Short lived production bikes or vehicles, Electrical, Tires, Paint, Brakes, etc. Use this for tech questions, and "Shoot the Bull" for general conversation, no tech.

I am playing with a new project and thinking about mounting a mag in the generator location of an iron head sporty motor. What I am looking for is some resources to use as reference material. I would like to end up with something similar to what they used on the xr bikes. I am able to fabricate / machine any brackets or gears necessary. I just don’t want to waste to much time reinventing stuff that has already been figured out by others. I have looked around for used xr parts but they seem somewhat scarce and rather expensive, plus I already have a few mags I could modify for the project. The cases are already modified as I bored them out for oversize Trock Shovster jugs. So if some welding and machining is necessary that doesn’t bother me.

Thanks Patrick, that is the kind of info I need, using a #2 cam gear makes sense and I think have one around here with a pitted lobe non-the-less. What are you planning to do regarding timing adjustment?

I have no idea where it came from. Just something someone sent to me. I would assume that by the wording at the lower left of the page that it was issued by Harley-Davidson Motor Company 04/03/1948 With that in mind I would like to thank Harley-Davidson for allowing me to post it. And for allowing others to use it in their work.

I am making the adaptor plate to fit the FM mag that was used to mount it to the KR's and the early XR750's.The gears and idler are available from Carl Patrick.Andy at antique speed and machine has complete Wico vertical and horizontal mags and all the gears including the virnier.He also is making the chain drive set up as is pictured on the previously posted drawings.

My friend has run a Stock HD Circuit Breaker at the generator drive on his 66 Shovel for years. It was set up with the right combination of gear blanks. There is an adapter plate that bolts in where the gen was and the Circuit Breaker mounts to that. He is running an alternator left case for the charging system. It took a little messing with gears to get the right ratio, but it works fine.

indianut wrote:My friend has run a Stock HD Circuit Breaker at the generator drive on his 66 Shovel for years. It was set up with the right combination of gear blanks. There is an adapter plate that bolts in where the gen was and the Circuit Breaker mounts to that. He is running an alternator left case for the charging system. It took a little messing with gears to get the right ratio, but it works fine.

The bike is about 75 miles from here, but I will see if I can get his Wife to take me some pics. I may be up that way soon. I will say I Have Seen it, Ridden with It, and it is what it is and it works! I have asked him before, why, and was simply told, Why Not!